howdy luek
the best fert is a seasol fertalizer and then use a slow release or charlie carp fert and apply every 2 weeks or depending on tempurture of your climate
cheers dean
Your serissa foetida needs liquid feeding every 10 - 14 days in a month. They thrive best in an acidic soil so you can use rain water for watering, if available, or use Miracid.